I was tricked into downloading this "anti virus" app by a site I visited, it turns out that this version of the app is a virus and I already gave it app permission to lock my phone, anytime I try to switch of the app permission, it locks my phone, I have to deactivate the app's permission before I can uninstall it. Please I need help on what to do.

Check these two settings to see if you enabled it to have access to them, turn it off if you did.

Try following this guide https://www.unlockunit.com/blog/how-to-tell-if-your-phone-has-a-virus

And if you still can't remove it, I suggest you backup your data and do a hard reset to restore your phone to its original factory settings.

Just do a factory reset and get it over with.

Make sure you backup your data and apps.

You don’t have to panic !!
Go to your settings and deny them of accessing your phone ! It’s your phone bro
Only you can librate from it
Check on my screenshot