Hey there @SadEdjo - thanks so much for your question! Firstly, check out our New User Guide - it’ll def prove helpful as you get used to the platform! 

Calendly does not currently integrate with namecheap calendars. Below is the info you’ll need about setting up calendar connections and what platforms we do integrate with! 

Navigate to your Calendar Connection page from the drop-down menu on the top right corner of your page.

Select which type of calendar you will be connecting. Calendly integrates with the following platforms:
Google
Office 365 or Outlook.com
Outlook desktop for Windows PC
iCloud
Exchange
 
Once connected, take a look at the settings on your Calendar Connection page.

If you have connected more than one calendar, use Edit to choose which you would like Calendly to check for conflicts. Any events labeled busy in the selected calendars will be read as conflicts, and those times will be removed from your scheduling page.
You can also select which calendar you would like your Calendly events added to. When an invitee chooses an available time to meet with you, the details will be published to your connected calendar and the Scheduled Events tab on your Home page automatically.
 
Note:
You can only publish events to one connected calendar.

I hope this helps!