How to create this text balloon

How can I create these text balloons? Or even better: Where can I find answers on this kind of beginners questions without bothering you people?
text balloon

It is a plugin

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No plugin needed. Group the component and give the group a name.

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Right-click on the group (purple rectangle) and type the text you want in the blank space at the top of the drop-down.

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Thanks Joseph, Luis!