how to integrate script and mybb forum need help ?

[Silver_Brick]

I cant even understand how to integrate and i have downloaded mybb 1.8.5 too

[Hall of Famer]

Mysidia v1.3.4 integrates with MyBB 1.6, not version 1.8. For MyBB 1.8, you need a workaround provided by Kyttias. Read this post for more details:
http://mysidiaadoptables.com/forum/project.php?issueid=52