To skip Saturdays and Sundays, please login and visit Admin >> Manage Branches >> Branches >> Edit. There, you will see Optional Fields: Branch Holidays section below, You need to select Is Saturday a Branch Holiday? and Is Sunday a Branch Holiday?. When you add a new loan, the repayment schedule will skip Saturdays and Sundays and any holidays you have entered.
The above only applies to new loans that you enter after making the above changes. Previous loans will remain untouched.