The Simple Membership Plugin uses the membership level to determine if a certain user can view the protected content from the front-end of your website.
If content is protected against a certain access level and the user doesn’t have that level to his account profile, then the plugin will hide that content.
If you want your WordPress admin user to have access to the protected content then do the following:
Step 1) Create a new membership level for this admin user. Lets call it “Admin Access Level”.
Step 2) Import your WP Admin user into the “Admin Access Level” using this addon.
Step 3) Give this newly created level (Admin Access Level) access to all your protected content.
Step 4) Now log out of the site and then log back in.
Now, when you are logged in using this admin account, you will be able to see all the protected content from the front-end.