Hi Andrea,
Yes, you can tag the project at important milestones. You can do it on the project page as follows:
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At any point of the design, on the project page, clicking on the grey mark (bottom-right ) will engage the versioning tool. There you can enter information like version name and description
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If you have progressed in your design and want to tag/version pervious edits, then you can use the options - play backward, play forward, pause, etc… . Once you click on the grey mark, the versioning tool will be engaged and you can enter information.
Hope this helps. Let me know if you have any other questions.
Yashwanth