This one is a classic.

How To Buy $DER:

1. Create a Phantom Wallet
2. Get Some Solana
3. Connect to Jupiter, Birdeye or Raydium
4. Swap Solana for $DER

Use Contract Address:
GibJs7cETwyGZ6QbWZTSfDg9RV9HZZ4mPxfYD2AeKPPA