Dark Brown to Dark Ash Blonde?

I have dark dark brown hair with some blonde highlights, I decided last minute I wanted my hair to be a little lighter since it’s summer time. I went to Sally’s and bought Dark Ash Blonde color. 
Now because my hair is so dark now, in order to go lighter would I have to bleach my hair first then put the dye in or would it work if I just put in the dark ash blonde dye in my hair and let it go lighter it self? 
I’ve never went lighter before so this would be a change for me. 

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