Juliet's nurse carries out a couple of different sets of instructions Romeo gives her in Act II, Scene IV. The first set of instructions he gives her concerns getting Juliet to meet him in Friar Laurence's chamber. He tells Nurse to inform Juliet to find some way that afternoon to go to Friar Laurence's cell for confession, or shrift. There in Friar Laurence's cell, they would be married.
In this same scene, the next set of instructions Romeo gives Nurse is to wait behind the abbey wall for Romeo's manservant. There, Romeo's servant will give Nurse a rope ladder that Romeo will use to climb into Juliet's room that night for their secret wedding night, as we see in his lines:
[My manservant will] bring thee cords made like a tackled stair,
Which to the high topgallant of my joy
Must be my convoy in the secret night. (II.iv.174-177)
Hence we see that the steps Nurse is to take to follow out Romeo's instructions are (1) tell Juliet to meet him in Friar Laurence's chamber for their wedding, and (2) retrieve a rope ladder for Romeo to use later that night.