Hello Mubarak,
We do not have official wording but we appreciate any acknowledgement of the software when used in research. Typically authors have a statement along the lines of “The numerical results presented in this work were produced using ….”.
As for whether you need to acknowledge the institution for access to the software that you would need to address with the institution as most have their own policies. Though most if not all will require acknowledgement of any funding agencies whose funds supported the work.
Scott