Nikky's short poem starts from a familiar saying: the present is a gift. People use it to cheer us up, to remind us to appreciate the moment we're in. The speaker takes the line literally and turns it around. If the present really is a gift, why would they want to send it back?
The wordplay carries the whole poem. "Present" means both "right now" and "something you're given," and the speaker uses that double meaning to admit something uncomfortable. Right now doesn't feel like a treat. It feels like something they'd happily return, like an unwanted item with the receipt still in the bag.
The mood is dry, quiet and a little sad. The joke is light, but what sits underneath it is heavier: the speaker may be unhappy, restless, or worn down by the moment they're living in. The lowercase "i" adds to the sense of someone small and tired, speaking plainly rather than asking for sympathy. The title, "Metaphors," fits, since the poem pulls a comforting metaphor apart.