I create an account but then during data collection the software is just indicating Join project. am using a Tab in my data collection.
In order for you to collect data on a project you need to join the project first. You join a project by either creating the project or by joining the project from the projects photosynq webpage or from the project page on either the mobile or chrome app.
Did you choose to join the project? If you did, then you will be able to contribute data to that project.