Welcome to the forum.
By "Export video images," is it safe to assume that you mean a Frame Capture of a single Video Frame to a Still Image Format?
If so, then John T's link should get you there. Note, some of the instructions might differ by version of PrE. Which version are you working with?
If you mean something else, like Exporting a Video from only a portion of your Timeline, please let us know, as the instructions will be different.
Depending on your follow up information, you may find helpful the following blog post "PE11: Freeze Frames, Single or More Than One at a Time" which includes written detailed Premiere Elements information on the topic supplemented by graphics.