Note:
Always consult with print companies regarding printer profiles, some may provide custom color profiles for you to use.

Selecting a color profile gives the designer almost full control of what the output of a project will look like. Images should be converted using Adobe Photoshop prior to importing.

The first step is choosing edit then convert to profile.

The next step is putting a check in the box to show the preview (if not already).

Next grab the RGB or CMYK drop down menu and select your desired color profile. Adobe RGB (1998) is a great RGB profile to design in as is U.S. Web Coated (Swop) v2 for CMYK.

Once that is done click ok to finish.

Note:
Depending on what color profile was chosen a shift in color may occur.

First Click:
Right click on the measurement ruler on the top or left as shown in the image below.

Second Click:
Choose your new measurement type from a menu of 7 measurements.

Note:
Your current measurement will have a check box next to it.

Anything you can do as a designer to reduce time spent in the menu is beneficial.