Tinder was not intended to be used for couples. Other dating apps will allow you to link couples accounts, or they might permit you to make twin accounts. Tinder does not let you do either of these options because Tinder was not meant to be used by couples. Since Tinder was not designed to be used to couples, you will find fewer people are willing to be a third in a relationship.
Instead, what a couple may do is to make one female profile. The couple may then set the settings to looking for other females. You might get matches but, you might not get any dates because people do not like being deceived on dating apps and, pretending to be just one person when you are indeed a couple is creepy, and you will scare people off by doing that.
Tinder also gives its users a limited number of swipes per day. If you need more swipes than that, you can purchase either the Tinder Gold or Tinder Plus service. Free users of Tinder also get one free Super Like. Super Likes are used to let potential matches that you are very interested in them. If that person matches you as well, then the two of you can begin messaging!