In music a slur is a curved line that connects two or more notes on a score, to indicate that they are performed smoothly .

Without looking at your tab I can only guess that you are talking about hammer on and/or pull off, which are part of Articulations in music.
Hammer on: Play the lower note, then hammer on to the higher note, using another finger.
So, you attack the first note only, and the other note is produced by the hammer on.

It would be great if you post the tab here, so we can take a look at it, and be able to respond in the proper way.

Hope that helps