Your installation instructions including the video tutorial teaches to set Appearance/Menus. The below is from the instruction:
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Tertio
You need a WordPress Login/logout/Register link. Select one or more of these possibilities :
In Appearance / Menus, in the Rencontre block, select ‘Log in’ and ‘Register’ and add to the menu. Save. If you don’t see the Rencontre block, check “screen options” at the top right.
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Here is the instruction at the top of Rencontre/General page:
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How to install this plugin ?
In Pages, edit or create the page of your choice. Add the shortcodes [rencontre][rencontre_libre] in this page content.
You need the WordPress Login / Logout / Register links. Take a look in Appearance / Menus if your theme has not these links.
In Rencontre / General, set the plugin page and save.
Add a new subscriber member in WP. Login this member and go to the plugin page (1).
More details in the F.A.Q.
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So the question is how I can add these links?