and still throwing errors at me.

umm thats strange, whats inside that .htaccess file?

Options -MultiViews +FollowSymlinks -Indexes

#
# If mod_security is enabled, attempt to disable it.
# - Note, this will work on the majority of hosts but on
# MediaTemple, it is known to cause random Internal Server
# errors. For MediaTemple, please remove the block below
#
<IfModule mod_security.c>
# Turn off mod_security filtering.
SecFilterEngine Off

# The below probably isn't needed, but better safe than sorry.
SecFilterScanPOST Off
</IfModule>

#
# MyBB "search engine friendly" URL rewrites
# - Note, for these to work with MyBB please make sure you have
# the setting enabled in the Admin CP and you have this file
# named .htaccess
#
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule ^forum-([0-9]+)\.html$ forumdisplay.php?fid=$1 [L,QSA]
RewriteRule ^forum-([0-9]+)-page-([0-9]+)\.html$ forumdisplay.php?fid=$1&page=$2 [L,QSA]

RewriteRule ^thread-([0-9]+)\.html$ showthread.php?tid=$1 [L,QSA]
RewriteRule ^thread-([0-9]+)-page-([0-9]+)\.html$ showthread.php?tid=$1&page=$2 [L,QSA]
RewriteRule ^thread-([0-9]+)-lastpost\.html$ showthread.php?tid=$1&action=lastpost [L,QSA]
RewriteRule ^thread-([0-9]+)-nextnewest\.html$ showthread.php?tid=$1&action=nextnewest [L,QSA]
RewriteRule ^thread-([0-9]+)-nextoldest\.html$ showthread.php?tid=$1&action=nextoldest [L,QSA]
RewriteRule ^thread-([0-9]+)-newpost\.html$ showthread.php?tid=$1&action=newpost [L,QSA]
RewriteRule ^thread-([0-9]+)-post-([0-9]+)\.html$ showthread.php?tid=$1&pid=$2 [L,QSA]

RewriteRule ^post-([0-9]+)\.html$ showthread.php?pid=$1 [L,QSA]

RewriteRule ^announcement-([0-9]+)\.html$ announcements.php?aid=$1 [L,QSA]

RewriteRule ^user-([0-9]+)\.html$ member.php?action=profile&uid=$1 [L,QSA]

RewriteRule ^calendar-([0-9]+)\.html$ calendar.php?calendar=$1 [L,QSA]
RewriteRule ^calendar-([0-9]+)-year-([0-9]+)-month-([0-9]+)\.html$ calendar.php?calendar=$1&year=$2&month=$3 [L,QSA]
RewriteRule ^calendar-([0-9]+)-year-([0-9]+)-month-([0-9]+)-day-([0-9]+)\.html$ calendar.php?action=dayview&calendar=$1&year=$2&mo nth=$3&day=$4 [L,QSA]
RewriteRule ^calendar-([0-9]+)-week-(n?[0-9]+)\.html$ calendar.php?action=weekview&calendar=$1&week=$2 [L,QSA]

RewriteRule ^event-([0-9]+)\.html$ calendar.php?action=event&eid=$1 [L,QSA]

<IfModule mod_env.c>
SetEnv SEO_SUPPORT 1
</IfModule>
</IfModule>

#
# If Apache is compiled with built in mod_deflade/GZIP support
# then GZIP Javascript, CSS, HTML and XML so they're sent to
# the client faster.
#
<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE application/javascript text/css text/html text/xml
</IfModule>

# Note: You are able to choose a different name in the Admin CP. If you've done that you need to change it here too
<Files "error.log">
Order Deny,Allow
Deny from all
</Files>

_____ in the origonal htaccess

umm thats enough strange, it shouldnt throw errors anymore, since Mysidia Adoptables should no longer affect your forum directory with a custom .htaccess. I aint sure if your error is indeed caused by the script, it may as well be a MyBB issue. What is the error message you get anyway?

Warning: require(../inc/config.php): failed to open stream: No such file or directory in /home/nirainia/public_html/classes/class_initializer.php on line 97

Fatal error: require(): Failed opening required '../inc/config.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/nirainia/public_html/classes/class_initializer.php on line 97

I see, so clearly Mysidia's .htaccess is still affecting your forum. I think one reason is that Mysidia Adoptables was made compatible with MyBB 1.6, so if you use MyBB 1.8 its likely to give you some troubles. I will fix it for you once the ftp works, dont worry.