Azure: How to move databases into Elastic Pool

Question

We have a few databases in Pricing Tier: Basic, S0... like below picture:

These databases were created before a new Elastic Pool is cr

Answer 1

Fast answer if don't want to read any link, you just want do OP asked:

1. Go to Elastic Pool
2. Select Configure (yes, there where you have the options to scale the pool)
3. Behind the tier specification you have three tabs "Pool settings", "Databases" and "Per database settings". Go to "Databases".
4. Just add/remove databases in/out of the pool
5. Don't forget to hit Save to apply all changes you made.

⚠ Take in mind that all databases you want to add to the pool should be in the same Server than the pool.