By default, the users will receive an activation email after signing up to their website and require to activate their account to be able to access the site. As a workaround, you can check this third-party plugin to bypass the activation process for the users that will register on your site: 

https://wordpress.org/plugins/bp-disable-activation-reloaded/

Please note that this plugin is created and developed by BuddyPress which is responsible for maintaining their plugins in line with Buddyboss to ensure they work correctly. 

Just to let you know, we have not tested it with the platform so we cannot promise any compatibility, but BuddyBoss works on all correctly built WordPress plugins so it should work fine.

Note: This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.