Kindly follow below steps to collaborate your project with me.
1. Select project from project dashboard which you like to collaborate.
2. Navigate to "Organization". Kindly refer below screenshot.
3. Add e-mail ID under "Collaborator Email" with which you like to collaborate your project.
4. Use "ALL Projects"if you like to collaborate all your projects.
5. You can also collaborate specific project by selecting project name under "Enter projectname(s) which you grant access."
6. Click on "Add New Collaborator"