Did you not read the screen where you clicked on the TRANSMIT NOW button ... it said you cannot stop the return. 

Can I cancel a pending return?

No. After you select Transmit Returns Now, your e-file goes to pending status, where it will stay until it's either been accepted or rejected by the government.

Think of pending as "in transit" or "in limbo"—just like you can't cancel a letter that you sent yesterday, you can't cancel a return that's on its way to the government.

To make corrections or changes to your pending return, wait until your return's either been accepted or rejected.

• If your return gets accepted, you'll need to amend.
• If your return gets rejected, you'll be able to make your changes before you re-submit your return.

Related Information:

• How do I check my e-file status?
• Can I amend a pending return?

What does "Pending" mean? 

Pending simply means that your e-filed return is on its way and that the government hasn't accepted or rejected it yet.

If you e-filed your return in January, it'll stay in Pending status until the IRS starts processing the backlog of returns.

After January, e-filed returns generally sit in Pending status for 24–48 hours before coming back as either Accepted or Rejected. Sometimes state returns stay in Pending for several days or even longer.

Keep calm and check back

Until your state or the IRS processes your return,  you may hear there's "no record found." That actually means the return's still being processed. Just check back in a few days.

Related Information:

• Can I cancel a pending return?
• Can I amend a pending return?
• Why doesn't the government have any record of my pending return?
• Why is my state e-file still pending?

Im having trouble e filing for my stimulus. Im doing it on my smart phone. It wont show the full screen to submitt my information. Any ideas or advice????

Stop using the phone ... go to a computer. 

Or try the IRS version instead ... https://www.irs.gov/coronavirus/economic-impact-payments