How to Stamp digitally

Hi, i want to put stamp & signatures on the invoices or purchase orders. i have stamp & signatures in the computer that i want to paste. how may i proceed with that.

Note: i am new and also not from accounts dept. so you want to guide briefly. Thanks!

use custom fields.
read the guides
https://www.manager.io/guides/8941
https://www.manager.io/guides/16188

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