In Illustrator, brushes are imported using the Brushes panel. To open the Brushes panel, click the Brushes tab at the top of the Illustrator workspace. Or click the Window tab and enable the Brushes tool.
To import a brush, first select the brush you want to import. Then, click the Import brushes button at the bottom of the Brushes panel. Or click the library icon and then Save Brushes.
The Brushes panel will open and display the brushes you selected. To add a brush to your panel, simply click on the brush thumbnail. Then save it in Adobe Illustrator’s preset brushes files.
Once you have imported the brush, you can use it in your artwork just like any other Illustrator brush. To hide the imported brush, click the Hide brush button at the bottom of the Brushes panel.
To find the newly imported brushes, go to the brush library and select User Defined>Folder Name>Brush Name. Such as User Defined>Imported Brush>Watercolor Stains Brush, as shown in the example below. Finally, try each brush and see if it works as expected. If it does, use it to add more distinct texture and character to your artwork.