Serious problem with the membership plugin

Hello again,

Ok, I've install the membership plugin, it works fine, I try to purchase a plan went through with 2 checkout.

But one problem I've is that, the members admin is totally empty, even though I address access on the access lever to all the menu within the main admin panel, but none are showing.

For example:

The entire wordpress left menu can't show.
The appointment plug isn't showing.
The custom widgetes aren't showing.

So what seems to be the problem?

Need your help.