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I thought I would try to accomplish as much as possible on my Mac before looking for other options to complete the final steps of my map. QGIS 2.12.1

Greetings
I am at Part 8 of the map making tutorial . Step 30 states: Move to the additional options tab and select "all in one folder" and make the prefix Lines_ .
Unfortunately the prefix option is missing for this plugin on Mac OS X. ?
Can someone offer some advice on this?

Dan
Thanks for the clarification on the labels.
I suspect Garmin controls other aspects of the final map (for example: color and width of road types,font style for labels,colors used to differentiate between State and National Forest......) 
D.

I'm following the multi-step tutorial for making a map. After getting through step (4) I began to wonder how labels become part of the shapefiles created.
I can add labels for each layer in the QGIS Project but how does this transfer to the final map for my GPS.
Sorry if I'm not asking the question correctly as I am not too savvy with computer use.

BTW I'm doing this all with QGIS on Mac OS X 10.8.4.
D.