hi,
sorry for the delay in repone due to support holiday
As you know that this is a totally BuddyPress module.
Please check that if there is some activation key in the link that is emailed?
It should appear something like this :
http://your-site.com/activate/65c11d3e24b5499c46cbcd073bd13967/
where value marked in dark is activation key pasting this in the textbox and submitting on activate page will also activate the account of the user.
Please also try to setting a redirect page in wp-admin -> wplms -> buddypress -> "Redirect Page on User Activation" .