From the Dashboard, click on Account and select Users from the drop down.

In Show Users Section, click on the Email Address of the User

In the User settings page, click on Agent Interface Options tab.

Click on Select Agent ACL and select your desired existing settings. You may also click on Create Profile if you want to create a new custom profile.

When using an existing Agent ACL, you may press the Edit Profile button to edit the User Agent Interface Options.

Scroll down to Allow Manually Calling Leads In Final Status:

• Yes - allows agents to manually dial leads in Final Status
• No - restricts agents to manually dial leads in Final Status.

Go back to Select Agent ACL and click Save button to save the updated settings of the User Agent Interface Options.

Scroll down to the bottom and click on Apply Changes 

See FAQ for Disposition settings. How to Edit Dispositions

See FAQ for Disposition settings. How to Configure the Agent Interface Options