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It's a green app with a white text bubble that's typically found on your home screen. If the app opens within a conversation, tap the "Back" arrow (<) in the upper-left corner of the screen. It's in the upper-left corner of the screen. The buttons are on the left side of the screen and will turn blue as you select conversations. Conversations can use a lot of data, especially if they contain multiple messages with media like photos or videos. It's in the lower-right corner. All of the selected conversations will be removed from your device.
Open the Messages app. Tap Edit. Tap the buttons next to conversations you want to delete. Tap Delete.