ProConnect Tax is an input form driven tax product.  You do not enter numbers directly on forms and schedules.  You will need to go to the input forms for that specific income or adjustment to make your entries, which would then flow to Sch 1.

Navigation to the various input screens is done on the left panel.  Click on Income and you will find the input screens for the various types of income-related entries.  If your input is for adjustment for AGI, you'd click on Deductions > Adjustments to income for those input screens.  One exception to the rule is that the input screens for income related to Foreign Earned Income Exclusion are found under Deductions.

Check return > Find the form > Find the box or line you want > Click (regular left click) on that line or box > look carefully at where the program put your cursor.