It would be helpful if you told us what type of drone you have and if it is a strange, no-name brand, a photograph or two might be of help…
Now, assuming there are no gimbal guards or propeller straps that might be holding the arms against the body.
Read All of this prior to attempting anything…
To unfold the front arms on most drones (specifically common foldable models like the DJI Mini or Mavic series), you generally swing them horizontally forward until they lock into place.
Unlike the front arms, most rear arms often pivot downward or backward until they lock…
Note… For some older models like the Mavic Air, you should unfold the rear arms first, followed by the front arms. On newer models like the Mini 3 Pro, the arms can be unfolded in any order.
Warning… Do not force anything… Remember, Drones are generally built with the minimum of material to remain as light as possible so you cannot “muscle” the arms into position…
Special Note 1. Vertical Rotation (Mini Series & Some Budget Models): Some older or smaller drones require you to rotate the front arms upward and forward.
Special Note 2. Button or Switch Locks: Certain older budget drones (like the JJRC H39WH) may have arms that unfold easily by hand but require a specific switch or button to be pressed to fold them back or lock them in an open position
Finally, If you know the make and model of your drone, You might try looking for a YouTube Video on your drone…