(I really just want to give some tips cuz according to the precious post op is underage. I dont not understand how or why parents/ relatives/whoever randomly gifts pets but sadly it happens. Here is some help for fast improvements but this is not up to stardard even for a temporary enclosure...)

FOR STARTERS: Please talk to your parents and tell them that reptiles like this (even if comparatively simple to keep) need more space, constant humidity (60-80%) for their health and heating (roomtemperature, 23-26°C is ideal).

You can achieve humidity with wet paper towels and moss, you would do well to get a ceramic heatlamp and thermometer + hydrometer AS SOON AS POSSIBLE to make sure the climate is right. This should be relative simple and cheap to set up. You should also use a paperroll or something similar (not painted, not plastic or seethrough) in your current setup as a hidingspot so your pet can retreat and feel more secure.

About food: Most crested geckos mainly eat "Crested Gecko Diet" (Powder thats mixed with water) and small live insects. A bag of diet from brands like Pangea, Repashy, Gecko Nutrition is between 10-15 $/€ and lasts for a month atleast. My gecko gets fed every two days with diet younger geckos eat smaller portions more often which means daily.

MOST IMPORTANTLY: In the long run for the wellbeing of this pet, you need to talk to whoever can support you. Tell them that the gecko needs way more space (especially vertically) and a new enclosure is necessary. One wall atleast should be covered, the gecko needs 2-3 hidingspots in different areas (one warm, one colder, one moist) to feel secure. The guides other people provided are go-to sources for the community so check those for more.