No theme/Addon working

I have uploaded theme, only one theme worked. Other themes are not showing. Also no addon are showing. Would like to have like button to comments but nothing is working good. Not sure how to do it.
My website link is edutainmentforum.com
Kindly help.
0
Comments
Maybe you should start with the last point (clearing cache)
ok. now i am facing below issue.
{ "Code": 403, "Exception": "You need the Garden.Community.Manage permission to do that.", "Class": "Gdn_UserException" }
cannot post.
https://open.vanillaforums.com/discussion/comment/253054#Comment_253054