If you want to buy and hold Radcoin
Simply swap your SOL for Radcoin. This is the direct way to accumulate tokens. You’re not putting Radcoin back into the pool; you’re just becoming a holder.
If you want to provide liquidity (and potentially earn fees)
You’d add liquidity to the pool, typically as a SOL–Radcoin pair. This means you deposit some of your SOL plus some of your Radcoin into the Raydium liquidity pool. In exchange, you receive LP (liquidity provider) tokens, which can earn trading fees whenever users swap Radcoin ↔ SOL.