The Schedule E doesn't include a category specifically for software, so most of our customers would categorize expenses like these under 'Management Fees' or 'Other' expense accounts when booking the software fee as an expense.
​
If you'd like to add a sub-account under one of these categories in your chart of accounts specifically for Software, you can do so by opening the right-side menu (3 horizontal lines next to your name in the upper right corner) and selecting the Chart of Accounts page. Click +Add Account in the upper right corner and follow the prompts from there. See the help article in our Knowledge Base for screenshots.