Ushahidi v3 has a Demo Site to help users test.

Use the Stand-alone Demo Site

This site allows any user to easily test v3 without having the heavy technical lifting. No code knowledge required.

1. Go to http://demo.platform.ushahidi.com
   
2. Create a new account or use the demo admin
   username: admin
   password: admin
   
3. Go ahead and start playing with views, creating posts..  explore.