It can happen that YAMM menu doesn't load properly, or that some entries are missing. This is just a temporary issue and in general it is automatically fixed within a few seconds.
I can only see 'Help' in the add-on menu
If you can only see 'Help' under Add-ons > Yet Another Mail Merge, it is usually an issue related to Google Sheets.
Simply refresh your spreadsheet, wait a few seconds, then try YAMM again.
I don't see 'Open tracking report'
When you open a spreadsheet that has been shared to you, you might see 'Configure form submission notifications' instead of 'Open tracking report':
This is because YAMM is not activated in this Google Sheets yet. To do so, go to 'Add-ons > Manage add-ons...'. Then next to YAMM, click the green button 'Manage' and select 'Use in this document':
Close this pop-up, refresh your spreadsheet and you should see 'Open tracking report' again: