I've quoted a guide on how to create a Segwit P2SH Bitcoin address that starts with "3" in Electrum, however it doesn't have any screenshots. I think it would be a good idea to do so, this will help newbies understand it better with images. I am hoping that these little images helped you somewhat.1. Go to iancoleman's BIP39 seed generator[1] (optional - download the source code and run offline for better security);
2. Select 12 words and generate a new seed;
3. SAVE THIS SEED AND DON'T LOSE IT! You can't see it again in Electrum and without the seed you can't restore your wallet in the future;
4. Download Electrum[2];
5. While creating the wallet, select: Standard Wallet -> I already have a seed -> Paste the seed from step 2.
6. Click Options -> check "BIP39 seed" -> Next.
7. In the Derivation part, paste m/49'/0'/0'/0 and click next.
8. Now you have an Segwit wallet with addresses starting with 3.
I am sorry. I know you have good intentions but this guide is outdated and you should never use it again.
You don't need iancoleman.io or whatever. Just click on Electrum in new wallet and put the derivation path tryninja said.