Yes, you can.
As an author who is affiliated with Freie Universität Berlin, you may self-archive your publication (under the 'green open access' model).
First you should ascertain whether the journal publisher allows open-access self-archiving or not. We recommend the SHERPA/RoMEO database for that purpose.
There you will find copyright and open-access self-archiving policies of academic journals.
Please note, however, that the information in that database is not legally authoritative.
In case of doubt, you should contact the publisher or the Editorial Team.
For the submission of your document, go to Dokumentenserver der Freien Universität Berlin.
On the repository site, click on authors’ section > submission of a new document > link to the form.
Now you can enter all relevant publication metadata. Be sure to state in the 'Authors’ comments' box that the embargo period has not yet expired. Additionally, please specify whether the version you are submitting has been peer-reviewed or not.
The editorial team will double-check the provided metadata and copyright restrictions. As soon as the embargo period ends, the article will be made accessible.
If you have questions concerning the procedure, please contact email@example.com.