Sorry, but you can't. Tulips grown in containers generally spend themselves and will not bloom again. If you like, you can set the pot in a cool, dry location (keeping the soil just barely moist) and you can plant the bulbs out in the fall. Just don't expect them to do much, if anything. If it were me, I'd toss them on the compost pile and buy fresh bulbs in the fall. As it is, most tulips don't last that long in the garden, blooming well for only two to three years tops.
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