How can I ask my doc about weightloss help?

If you are only "slightly" overweight, then no need to make an appointment just for that. Your doctor can't offer you any miracle resolution. Eating right and exercise are the standard methods to lose fat and maintain a healthy weight. Only for extreme situations are pills or surgery recommended.

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You didn't share with us your height/weight (so we can tell if you are really over what is recommended) nor what you've done in the past to try to lose excess fat. You could see if your insurance covers you seeing a dietician, as that is the type of person to speak to about fat loss (80% of what controls your weight, is what you eat). Unless you have a specific health issue that is preventing you from losing weight (or are on a medication that hampers it), a healthy diet is key.

When you are in the examining room waiting for the doctor, strip down completely naked.  When The doctor walks in and sees you the doctor will be so disgusted that he will feel it is necessary to help you lose weight.

Most doctors don't really know what to say because the key for fat loss wasn't discovered until recently and it is not yet taught in medical school. 

This is it:

If you're American, check your insurance policy.  It may provide coverage for help.  You should start by talking to your doctor - a referral may be required.  Past that, you can get some help with exercise routines from a personal trainer or physical therapist as well as help on eating habits from a nutritionist.  Insurance may cover some or all of this.  Your doctor may also be able to point you to qualified and low cost options if your insurance doesn't cover it.  If you don't have insurance, try Youtube exercise videos and check your local library for books on nutrition and healthy cooking.