To join a community, follow these steps:
1. Click on the menu icon in the lower right corner, then select the "Communities" option.
2. In the communities section, click on Join a Community and enter your community name, it should appear on your dropdown.
3. Enter the community's password, and you will see your community below in the section named "Your communities".
4. To be able to see your community, on your view challenge page click on the "rocket icon" and select the gear icon in the dropdown that will appear after you click on the rocket icon.
5. Then after clicking on the tool icons you will see the option to filter your map, and select your community and the click "Save & Close"
6. And now in the map you will see your community filtered.
Here are the steps above in action: