Many forums support Sketchfab embeds. Some forums accept them natively, which means you will find a Sketchfab button in your post editor, and you just need to copy and paste the model URL of your model to embed it. See Embed on Web Platforms.
If you want to add Sketchfab support to your forum, check out our plugins (and the oEmbed endpoint):
Some forums just support our iframes, so you can copy and paste the embed code in the forum post. An example is Maxforums.
For other forums, you can use a BBCode embed. It will display the thumbnail of your model with a link to view it in 3D. Here is an example on CG Society.
You can switch between HTML (iframe) and BBCode in a model's embed options.
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