How do I use Yahoo portfolio?

Welcome to Yahoo Finance Portfolios Track your performance with real-time data and news related to your symbols. Manage your holdings efficiently and create custom views using over 60 data points.

From a mobile browser:

To experience all of the Plus features on the Yahoo Finance app, go to the Yahoo Finance app page and click on Get it on Google Play.

Log in to your online account. Look up the symbol of the stock you want to purchase, which you can find online at any number of financial information sites. Enter the stock symbol and the number of shares you want to buy.