Start here:
https://hubofhope.co.uk
Enter your postcode (or simply 'Belfast'). On the next page, select an option that looks like it might be right for you OR (possibly better, if you're not really sure what you're looking for) use the 'skip this step' option at the top of the page.
Then click 'Refine my results' and choose 'Peer support group' (or 'Online or telephone support' or whatever else you think might be best in your case). From there, click on the links to see what services each organisation offers.
[Note: Many of the organisations will have 'Closed' next to them. That only means that their services aren't available right now, NOT that the organisation has actually closed down!]