A side can have several signers, for example two partners of the same company. Add them with + Add Signer under that party. To decide the order, choose Sequential routing. Under Signing order every signer appears with their party and a number, which you raise or lower with the buttons beside it. Signers with number 1 are invited first, signers with number 2 only after everyone with number 1 has signed, and so on. Give two signers the same number to invite them together. At first the numbers follow the order of the parties, so if you change nothing, each side is invited after the previous one. With Parallel routing everyone is invited at once and can sign in any order.