Choose Edit > Assign Profile.
Select an option, and click OK:
Don’t Color Manage This Document Removes the existing profile from the document. Select this option only if you are sure that you do not want to color-manage the document. After you remove the profile from a document, the appearance of colors is defined by the application’s working space profiles.
Working [color model: working space] Assigns the working space profile to the document.
Profile Lets you select a different profile. The application assigns the new profile to the document without converting colors to the profile space. This may dramatically change the appearance of the colors as displayed on your monitor.