Unable to add the custome keyword to test case

Katalon Studio Web Testing
#1

can any one please help me to solve this issue? please check the attachment.

Image: https://s3.amazonaws.com/katalon-forum/editor/fg/0yy3thboxj0q.png1366×768

Image: https://s3.amazonaws.com/katalon-forum/editor/a7/robj8x7di5sw.png736×373

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