An account Tracker is designed to measure the engagement with any public Twitter account. Each Tracker will monitor one account, and it can be yours or someone else's, as long as it's a public account.
To begin analyzing an account, go to your Trackers listing (the bar graph icon on the top left). Click the "Start tracking" button, which will give you a drop-down menu, where you can select Twitter Account.
From there, you just need to type in the Twitter handle you wish you analyze and selecting a time zone. After several minutes, the Tracker will populate with up 5,000 tweets for Starter and Team customers and 20,000 tweets for Social Suite customers from the past 30 days. It will then begin collecting data on an ongoing basis in real time.