Mattermost (the equivalent of SLACK) is now available as a service on PSNC premises. It is a part of an EUROfusion Standard Software stack.
If you are not sure whether you have access, please try to log in at the following page: https://gitlab.eufus.psnc.pl/users/sign_in and choose: EUROFusion IdP
If you do not now how to do it, follow the link: https://box.psnc.pl/f/3e58d93153/?raw=1
If you don't have access read on down below the section: What if I don't have access to EUROfusion Standard Software stack?
https://mattermost.com/download/#desktop
Video material that shows how to do it: https://box.psnc.pl/f/56190b3106/?raw=1
Video material showing how to create teams and channels: https://box.psnc.pl/f/2f5e3dbd58/?raw=1
If you don't have access to EUROfusion Standard Software stack, you need to get access first.
You probably have to ask him/her directly about that. In case your Principle Investigator doesn't have access, they need to create an account here: link
How to request access to EUROfusion Software Stack for team members: link
The best way to inform us about issues, problems is to use ticketing system: ACH-04 Support Tracker
If you can't access ticketing system, please write an e-mail to Daniel Figat (daniel.figat@man.poznan.pl) and describe your issue. However, this way of reporting bugs should be used only in case you can't access EUROfusion Software Stack and have issues while acquiring the access.