relink importing from files to Movie Maker

Hello,

"When you import a file into Movie Maker, the file is imported into the Collections database. The file itself is unchanged. When you build a project, Movie Maker references the original source file. For this reason the source file should not be moved to a new location or the entry in the Collections database will be invalid."

My question: How do I relink the source file from a new location?

Thank you