I downloaded a modpack and wanted to know how to activate this screen that shows the name of the block, being that everyone I saw downloading this modpack has been able to download this screen
You didn't state what version of MC your playing. That information block comes from another mod, not NEI.
The mod your looking for can be WAILA or One Probe, depending on your MC version.
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."