If you have received the error message "you must add at least one recipient and one document before you can proceed", this guide can help you.
The error message is because you have selected I must sign the document without adding other signatories. This function is intended as a shortcut for multiple signatories so that you can quickly add yourself. However, it is not intended to be used as the only signer.
If you need to sign the document yourself as the only signer, press add signer and enter your information. Then press add. You can now go ahead and get your document signed.