To change the role for a team member from Read-Only to Editor, Sign In in our Project 365 Online Portal and in Team Members page change the role for the desired team member. Note: 
1. By default, the owner of the organization has the Editor role.
2. If you already purchased a subscription, please know that you need to purchase a subscription for each Editor team member.
3. You can add as many read-only team members as you need for free.