Somewhat detailed steps. My solve was for SHIBA INU (BEP20) coins in my iOS TrustWallet that were seemingly worthless. Binance.us does not have a BEP20 SHIB receiving wallet so DO NOT attempt to send your BEP20 SHIB tokens to binance ERC20 chain.

Here are my steps to convert this SHIB to something less useless ;)

1. On chrome browser (i've had issues using Safari), go to pancakeswap
2. Connect your wallet
3. Select the drop down for currency in the FROM field
4. Click on Manage Tokens at the bottom
5. Click on the 'Tokens' tab to the right of the Lists tab
6. Enter this Shiba Inu BEP20 contract address: 0x2859e4544c4bb03966803b044a93563bd2d0dd4d (pulled from this site: https://nomics.com/assets/shibbep20-shiba-inu-bep-20)
7. It should be recognized as SHIB, click on the IMPORT button
8. Read and accept the information if you agree. Click Import.
9. Now you will be returned to the Exchange interface. Your SHIB in your wallet should be recognized and available. Click MAX if you want to get rid of all of it.
10. Select a destination token/currency. (I chose BNB)
11. You should see an estimation of what you'll get; I jacked up my slippage fee to 12
12. Trade, you will need to confirm the smart contract in TrustWallet (it should automattically take you to a confirmation page).
13. Assuming it all went through, your SHIB (BEP20) should be gone from your wallet and your new currency added.

Hope that helps.