How to add Fill Factor in the SQL script

I am trying to set up the relationship (Primary Key and Forign Key) in several tables. I would like to find a way also be able to set 'Fill Factor = 90%' in the script. Here is the code that i have so far:

ALTER TABLE Req
ADD CONSTRAINT FK_Req_Bow FOREIGN KEY ( BowID )
REFERENCES Bow ( BowID )

Any help would be greatly appreciated!

J827FILLFACTOR pertains to an index that you need to create for your FOREGN KEY constraint, not to the constraint itself.