I am not receiving the SMS code to my mobile how can i get this fixed?

I'll help you receive your SMS code, k-ousman.

We can start by restarting your phone and checking your network signal. It's also possible that your mobile number isn't the default option in QuickBooks Online(QBO) for sending a text message verification code. To verify, here's how:

1. Log in to your QBO account.
2. Click Sign in & security from the left menu.
3. Select Set up and make sure your phone number is correct.
4. Choose Text message so you'll receive a six-digit verification code.
5. Tap Continue and enter the code, then select Continue.

If the issue persists, you can use your email address to receive the code. 

Moreover, I'll share this article to help you record, edit, and delete expenses in QBO: Enter and manage expenses in QuickBooks Online.

Hit the reply button in the thread if you need further assistance in receiving account verification codes, and I'll get back to assist you.