To add a new signature please follow the steps mentioned below.
Step 1: Go to More option.
Step 2: Select the Signatures option.
Step 3: Tap the image to select the signature type >> Add signature by Drawing the signature, or by uploading the image of the signature from camera/gallery.
Step 4: Give a name to the signature >> Turn on the Set to default option to make the signature default >> Click on Add signature option to save the signature.