Yes, you can rearrange your credits and your resume!
On Your Profile, either from the Highlighted Credits or Credits section, click Edit. You can rearrange both section headers (Television, Commercial, etc.) and/or individual credits within a section.
Use the arrows to the right of the section heading to move that section up or down your list of credits.
Use the arrows to the right of each individual credit to move that credit within the section. The blue upward-facing arrow with the line above it will send it to the top of the section. The blue downward-facing arrow with the line underneath it will send the credit to the bottom of the section. The black arrows in the middle will move the credit one space up or down within the section.
When you are finished rearranging your credits, click Save.