Issue with Wordpress website need it fixed quick

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Issue with Wordpress website, need it fixed quick
Hey guys I’m having a problem with my site, a major problem any new plug-in I download doesn’t let me go to the settings it says you’re not allowed to access this page. I had my buddy look at the Settings and he says there’s some type of admin issue either something is locked down to another account, or I’m not allowed to write certain things now, even though I’m logged in as Admin, not sure what’s happening can someone help?
Skills:
PHP
, Troubleshooting
, MySQL
, System Admin
, WordPress

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