There are two main ways to invest in Pearler. You can either "manually select stocks to invest" or "setup an autoinvest" that automatically buy stocks with reference to your target portfolio.
Manually buy or sell stocks
Look for stocks on the Invest page by typing on the search bar at the top and ENTER.
Now you can either click on the stock and then click BUY.
or alernatively, you can add the stock that you are interested to your portfolio. On the portfolio page in the VALUE tab, you should see a button to either BUY/SELL.
You can set it up following the steps on the autoinvest page.