Adding contacts and sending templates from the app

It isn't possible to add contacts or send WhatsApp templates using Uchat app. If we want to send a message after 24h, and the content doesn't match with any possible flow (for example, to inform of something unexpected), we can just have a WhatsApp template with a blank space for that... the issue is that we cannot do it from the app, and we need to find a laptop, as we can't either add contacts or send WhatsApp templates in the app.