Can you show us a screen capture?
Also, what version of Lightroom and what operating system?
Are the images located on a local drive or external?
If you have LR open and you are in the Library module and you are selecting image they are already imported into LR.
If you have clicked the Import button in the Library module and the Import dialog window opens and you are going to a folder on your hard drive where image are stored and selecting them then click the ADD button at the top and see if the import button then becomes active. Or you first have to select a Destination where you want the images Moved To before the import button becomes active. Or those images are already in the LR catalog.
From your post it is hard to know the steps you are taking.