On the left, you will find all the tools available. Shapes, stickers, text boxes, templates and graphics can be added. On the right, you can click on the chat box icon to post messages for your peers.
To add other users, click on ‘Share’ and write the name of the project.
Then, add the email accounts of your peers to share the work with them.
Once you finish your work, click on ‘Export’ icon, and choose your desired file type.