Despite the horrible wording, it should read: raise the bond of three team members to 1. This can be satisfied with the original team of Natsu, Lucy, and Wendy. Other possibilities could be with Gray and Erza. To check this, go to the status page of an individual in your party and press R1/L1 to the music note tab. This is your Bond page, and those with a fulfilled Bond will have a solid music note. Once it is full, you should be able to see someone on the field with the similar music note to talk with someone. This will raise their bond level together.