Add the payscale to the correct grade
When adding payscales to a post you will first need to select the range of lower to upper grades. If the payscale you want to add is not added to any of the grades within this range, it will not be available to be selected.
Go to Setup, then Settings.
Click Module Settings, then Payroll Settings.
Click Pay Grade and Payscale.
Click the Grades tab.
Click the grade that the payscale needs to be included on.
Amend the lower to upper payscales on this grade as needed, in order to include the payscale within this range.
Click Save.
Select the correct grades on the post
Go to Admin Menu, then Post Setup.
Search for the post and click it.
Scroll down to Pay Details and click Edit.
Select the correct options from the Lower Grade and Upper Grade dropdowns.
Select the correct options from the Lower Payscale and Upper Payscale dropdowns.
Click Save.
Check the payscale's effective date
If the payscale you need to select on the post has an effective date that is in the future, you will not be able to select it on the post.
Go to Setup, then Settings.
Click Module Settings, then Payroll Settings.
Click Pay Grade and Payscale.
Click the Payscales tab and take a look at the effective date for the payscale.
Click the Effective Date dropdown at the top.
Select a previous date than the one that's in the future and scroll through the list of payscales that are set up for this date. If the payscale is not on this list, this means the only effective date for it is the one in the future.
In this case, you will only be able to add this payscale to the post on the effective date or later.