If a token doesn't show up in MyEtherWallet, you'll need to create a custom token.
In MyEtherWallet press the "Add Custom token" button and fill in the fields.
Fields example for adding Columbus Capital Blockchain Index (BLX) DAA:
- Address: 0xE5a7c12972f3bbFe70ed29521C8949b8Af6a0970
- Token Symbol: you are free to write anything here (without spaces or special characters), but the token symbol must be available/not already taken. For example, you can write BlockchainIndexBLX, CCBLX, DAABLX, JohnDoeBLX, etc.
- Decimals: 18