How to change the schedule for access restriction policies on WRT300N routers?

[TDIPAO20075308]

I can't change the days that a policy can be enacted in a WRT300N LinkSys wireless router. I'm setting up a restriction policy to work between Monday and Friday however it seems to be greyed out and I can't change it. I know this might be a easy fix however all the answers I've seen from questions like this have not been helpful. I've linked a picture of the part of the access restrictions that I need to be ungreyed. 

Any answer would be appreciated, I don't feel comfortable linking the project as it's for a university course, hope you guys understand.

[pieterh]

i have these suggestions (no device to test myself)

- enter a policy name before you can change the time schedule?

- select an existing policy from the drop-down list

- disable the policy , make changes and reenable

- delete the current policy and create a new