Please see below for platform-specific resources:
Web app
https://signnow.zendesk.com/hc/en-us/articles/201258596
iPad app
https://signnow.zendesk.com/hc/en-us/articles/201257686
iPhone app
https://signnow.zendesk.com/hc/en-us/articles/201257856
Android app
https://signnow.zendesk.com/hc/en-us/articles/201623533