The "Use" option allows you to select a default database, to be used for subsequent queries.
Every time you login to the Database Manager, you have to use this option to access an existing database.
To use a database select the "Use" option from the "Select" list and choose the specific database you want to work with. Click the "Run SQL Query" to complete the operation.
After performing "Use Database", you will have several options in the "Select" list to choose from in order to make changes to the database. These options include:
Alter
Create
Delete
Drop
Desc
Insert
Select
Show
Update