This platform is based on Discourse, currently the most modern open source online forum software. It is quite intuitive to use and does not need instructions for the basic functions. But if you’re new to Discourse and want to achieve a particular thing, you can look into the manual that we (Edgeryders OÜ) developed, over at our main forum:
https://edgeryders.eu/t/discourse-user-manual-for-edgeryders-eu/6463
If that does not answer your problem, you can also look into the official Discourse support forum, which also contains their documentation:
Or of course, put your question into a comment below and we’ll try to assist.