To setup Lessonspace in your WPLMS.There are a few steps to follow.
Create an account here https://www.thelessonspace.com
Get your API key from here https://www.thelessonspace.com/settings/developer
Go to wp-admin > vibebp > settings refer this: https://prnt.sc/wsshky
Add API key here https://prnt.sc/wssr9f and save the setting.
Setup side menu like this https://prnt.sc/wt3xnm check this doc https://wplms.io/support/knowledge-base/adding-buddypress-menu-items-to-profile-navigation-4-0/
How it will work.