The app will pop up a set of options depending on what settings you have enabled within Pulse SMS.
The app will allow you to schedule the currently typed message to the conversation.
If you have enabled Send Delay in Settings, you will be able to send the message immediately (without waiting for the delay). Otherwise, the option to send with delay will appear instead.
If you have enabled Signature in Settings > Advanced Features, you will be able to send the message without the signature applied.