At this time, the WizeFi free budgeting app does not have a web version. The website you have likely found is actually for a separate product, which contains more robust features (advanced reporting, what-if scenario planning, connecting with a financial coach, etc). This desktop only version contains a free 30-day trial but then costs $8.99/month.
Because these are separate products, your login credentials for the free budgeting app will not work with the paid website app. We do plan to release a web version of the free budgeting app in the future!