LDAP integration not working

So I have to set up Gitlab for my colleagues and get it running with an LDAP connection.
To be quite honest: I had nothing to do with Linux or Git before today - and the longer it goes on the more I want back to yesterday…

I followed the instructions on https://blue.cse.buffalo.edu/gitlab/help/integration/ldap.md (changed gitlab.rb) but it doesn’t work. If I check the LDAP configuration with
sudo gitlab-rake gitlab:ldap:check
it tells me that LDAP is not enabled. I just have no clue what else I should do but fill out all the settings and set ldap_enabled to true

Seriously, I’m completely frustrated and it doesn’t take much until my computer needs to go out the window… Please help otherwise my job’s out the window as well…