How to find your member Lenk

I need further urgent assistance on this post which has already closed

https://www.ads-software.com/support/topic/how-can-i-redirect-users-to-the-front-page-after-log-in?replies=3

This advice by member ‘Lenk’ really works very well ! Website
https://www.ads-software.com/support/profile/lenk

However after 2 days the site is unable to login saying ‘This webpage has a redirect loop’ and cant solve this issue since.

Anyone knows how to solve this or can wordpress advice how to reach Lenk?