You can access your forms' submission data from the Dashboard.
If a form has at least one submission, a number will appear to the left of Results in the middle button. Click on this button to be taken straight to the Submissions page for that form.
Alternatively, if you click on the three dots to the right of the Results button, you will see a menu appear with a few options. From here, you can select Submissions.
Finally, when viewing your forms in the List Layout, you can click the # Results button to see this page.
Note
If your submissions page is not up to date, you might just need to refresh the page to reload the submissions.