Give a description and name to this security group of “SQL-IN”.
Notice that you’re on the Inbound tab, so click Add Rule.
For now we are going to set some default settings just to get the rules in, because we are really after the ID’s of the Security Groups we’re about to create.
In the first drop down for Type, find and select MYSQL / Aurora. This will automatically select port 3306 as your inbound port:
On the Source drop down, select Anywhere:
Click the blue Create button: