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This image is called hero image or frontpage image ^^.
You may change it here Backend -> Components -> JomSocial -> Theme Designer -> General.
Just upload new image. It's used for frontpage only. Check Theme Designer and it features - it allows you also to change other default images.
- Instead of saying: 'it's not working', explain the problem in detail.
- Screenshots with the URL visible in them and the problem marked are more than welcome.
- Tell us how to replicate the problem, we can't fix it if we can't find it.
- Make sure that your site/server meets JomSocial System Requirements
- Make sure to setup JomSocial Cron Job
- Always provide us with access details to the backend and ftp. We need it to debug problems.
- If you have a similar problem, but a solution you found isn't working, open a new thread instead of 'merging' with an existing one.
- Use the "Thank You" feature on any post that helped you