Use a step-up ring.

The naming is based on the lens’s point of view:

• step-up ring: lets a lens with smaller filter threads use a larger filter
• step-down ring: lets a lens with larger filter threads use a smaller filter

Example:

• 72mm lens thread to 77mm filter = step-up ring
• 77mm lens thread to 72mm filter = step-down ring

So if you want to put a large-diameter filter on a small-diameter lens, you need a step-up ring.

One practical note: step-down rings are often less desirable because using a smaller filter on a larger lens can cause vignetting. Many photographers buy filters in one larger “standard” size and use step-up rings on smaller lenses so the same filters can be shared across multiple lenses.