I don’t know that we have enough information to give you good advice, or understand why you don’t have oil showing on the dipstick after adding 5 quarts. regardless of What model Seadoo you own, 5 quarts should be seen on the dipstick.
follow the owner manual for checking oil and get your oil level in between the high and low marks on the dipstick before you run your ski for any longer than a few seconds. Very low oil or high extra oil could damage your engine quickly.