PTO may not be a tax form-driven software but nothing is impossible, just impassable. 😉
You can still click on the Preview form button or go to the Check return tab, select All forms from the tree (to view all forms regardless of whether it's applicable to the return), scroll down to the form or schedule you're looking for, and, if there's a blue box on the line you're looking for, click on it and you should be brought to the input screen.
One note of caution (ok, maybe more than one) is that not all line items have that blue box. And even if there is one, it may not bring you to the precise input field or the exact input screen, especially if the entry can come from different places (e.g. 1099 vs K-1) or where input is required on multiple screens.
Still an AllStar
In the area for Deductions > Schedule A > look up a bit and across the top you should see Medical Taxes Interest Contributions .... Select Contributions
Pay attention to the first Check Box in that section regarding getting the $300 to the 1040 (1040SR)