Need to start a forum on sajawat.net, which would be managed by nontechnical people.
Can anyone suggest me a platform which is best for nontechnical and can be customized (if not then at least if complies with the website design which the above website has)
It might take some time for me to reply, i’ll be looking for your suggestions anyways.
As far as I can see, Tilda is a website builder (and has no forum option). The OP is asking about forum software which can be integrated into an existing design.
Discourse (what this forum uses) is a great choice and can be managed by non-technical people. In fact, you can do some minor theme customization (changing colors, headers, and other things) through the dashboard. It’s free if you set it up yourself or there are several dedicated hosts like DigitalOcean and others.
Both Discourse and your site make great use of whitespace so I think they would look great together. The one thing I don’t like is that plugin management is not intuitive but it comes out of the box with lots of great features!