You can learn more about how to download and install the PostTrack in the answer to the "Where can I download the PostTrack?" question.
After the PostTrack was installed successfully, you will be redirected to the "Getting started" web-page, where you will be asked to log in with one of your Google accounts - the PostTrack will work with the Google Mail on the account you are logged in with.
After signing in you will be redirected to the "Pricing" page, where you will be able to choose one of the pricing plans: "Trial", "Basic" or "Pro".
- If you will choose the "Basic" plan or the "Pro" plan, you will be redirected to the payment page of the selected pricing plan, and after successfull payment you will come to the PostTrack Office extension control panel.
- If you will choose the "Trial" plan, you will directly come to the PostTrack Office extension control panel.
After that the PostTrack will already work with Google Mail of you account. If something went wrong after the PostTrack installation and, for example, you was unable to select the pricing plan or log in with Google, you always can try again simply by going to the PostTrack Office extension control panel (https://posttrack.email/office) or by pressing the PostTrack extension icon in your browser.