The Tip menu is a customized activities list created by the model that is displayed in her chat room with the purpose of letting users know what she offers and for what number of tokens. What makes this feature unique though, is that it's an interactive menu, meaning that you can select the activity you want her to perform from the Tip menu and simultaneously pay for it.
If the model has a Tip menu, you will see a hamburger button next to the chat input field during her broadcast. Click on it to display it and then pick the activity you want her to perform. You can choose whether you want everyone to see your request in the public chat of just make it visible for the model. Hit “Send Tip” – the tip amount for your request will be already selected – and wait for the model to respond.