Hello Folashade,
Thanks for your question.
- To upgrade, you can follow the steps below:
Sign in to the Azure portal. - Search for Subscriptions.
- Select the subscription that was created when you signed up for Azure free account.
- In the subscription overview, select Upgrade subscription in the command bar. If you don't see the upgrade subscription option, select the upgrade banner at the top of the page.
- If you don't have a payment method for your account, you're prompted to add one.
- You might need to enter a phone number to verify your identity.
- Type a name for your subscription.
- Select Upgrade.
The above information was cited from: https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/upgrade-azure-subscription#upgrade-your-azure-free-account
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola