Plug-In’s Selection Not Accessible

My site has had some issues in updating most meta descriptions & page titles (actually, issues updating any description or title). While chasing a rabbit hole, I realized I don’t have WordPress set up correctly to trouble shoot correctly using the help of these forums because I can’t access the Yoast plugin because I can’t access any plugins at all.

Is this a problem with my access level or how WP is operating? I’m using WP 5.0.3

This is what my nav menu looks like:

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