I don’t have the option to open a savings account

Let’s start with the basics.

What you need to open and maintain an account

• Be an owner or co-owner of an active Apple Card account and add Apple Card to your iPhone.
• Be at least 18 years or older.
• Have a social security number or individual taxpayer identification number.
• Be a U.S. resident with a valid, physical U.S. address.7
• Set up two-factor authentication for your Apple ID and update to the latest version of iOS.
• Apply within US
• Apple Cash Account must be verified

iPhone must be updated to latest version of iOS, 16.4.1 

Update your iPhone or iPad - Apple Support