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In your screen shot you are trying to delegate 5.060 SP, so you will need at least that much. Until you have more than 15.0 though, it is not a good idea to delegate because you need SP to have enough bandwidth to use the platform.

Thanks to guide me,

Sir can you guid me about curation reward and how it be earn?

Please read the FAQ. There are also some posts listed in the "Welcome" page.