Openldap integration

Hi,
I installed a Wekan with the Snap method (very easy) on a Debian 9.8.
I now need to connect it to our Openldap but I don’t understand anything because it’s seems to be in command lines …
Is there a file (settings.json ?) to edit ? Where can I find it in the Debian tree ? Which lines do I need to write ?
Could you please make a step-by-step tutorial with the explainations for me ? It would be great !!
I would like to thank you beforehand for your help.