I hope the stock goes up so I can regain my money. But I havent taken out the interest in it. Can I throw the interest out by throwing away my spare money and keeping my stock money?

I have been doing investing with $2000.00 for about a year. I have made many transactions. My brother told me told me a small amount of interest goes into investor's money. He knows a lot about business I don't know how it works but he said a small amount should be calcualated and taken out. I'm going to ask how much I should take out. I have about 100 dollars left in a stock. I have also some money spare. I hope the stock goes up in sha Allah so I can regain my money. But I havent taken out the interest in it. Can I throw the interest out by throwing away my spare money and keeping my stock money? I have trouble understanding it. Maybe you do better understanding it.