Some keys on my electric piano were superglue together. It's down in between the keys. How do I fix?

It sounds like you are referring to the fallboard or key cover of your Grimmel Bros upright piano. To close the fallboard, gently push it up towards the piano's music stand until it clicks into place. The curved part you mentioned is probably the key cover, which can be lowered to protect the keys from dust and debris when the piano is not in use. To lower the key cover, grasp it at the center and gently pull it towards you until it lays flat over the keys. If your cats are causing problems by jumping on the piano keys, you may want to consider covering the piano with a fitted cover or keeping the room door closed to prevent them from accessing the instrument.

Try using Isopropyl Alcohol on the keys, pour some gently around the keys that are not working. (Make sure the unit is unplugged from power first) If you can get a can of compressed air you can blow out the keys and dry them out. If not let the unit dry out overnight. Maybe put a fan near it.

Fixing the keys on digital piano. try to watch the video maybe there is a tips to fix your piano. thanks

You'll likely need to try removing the keys, so you can see if something is stuck underneath it. That would be my first move.
In order to do this, follow these steps:

The front panel and the keyboard fall are designed to be easily removed for tuning purposes anyway.

To check it out....The front panel likely has a little clip either side near the top on the inside. Just undo these clips and lift the panel out. The keyboard fall should then be easy to lift out too.

There may be a long wooden rail which you need to take out also. Once inside, the keys themselves can be carefully lifted off the central spikes on which they sit.

Remember how you did this so you can get them back in again.

Since your piano is so old and worn, Often times, the wooden rail in front of the keys (just above your knees when you are playing) bows inwards a little due to age and temperature/humidity fluctuations. This then causes the little white front bit of the keys to jam against the wood and you have to physically lift the keys back up to return them.
If this is the problem you will need to take out the keys and shave some wood off the inside of this rail to allow the keys to move up and down freely again.
Or sometimes you may find you have a small object caught under a key or two. Much simpler to remove and free up your keys, if this is your problem..
Hopefully, this is all you will find wrong with your piano.
If all else fails...
I wouldn't attempt to tune your piano by yourself. I would seek out an experienced piano tuner for that.
But it is worth attempting to repair it first before you go that far.
Good luck !!

It would depend on why it's sticking. First thing to check is the key bushing felt, then see if the key has swollen and is rubbing the ajascent key. Past that, you'll need a repairman.

Resetting Instructions:
1) Try a partial reset by holding down the last white key while turning the unit ON.
2) If you haven't recorded any performance(s), for a full reset, hold down on the last white key AND THE lst three black keys while turning the unit ON.

Reset Instructions:
1) Try a partial reset by holding down the last white key while turning the unit ON.
2) If you haven't recorded any performance(s), for a full reset, hold down on the last white key AND THE lst three black keys while turning the unit ON.

Old reply so hopefully it's fixed. Dust or hair can get through the gaps and land on or near the contacts of the electronic key sensors. To be on the safe side (rather than doing a diy) take it in to the technicians. They'll have it fixed in a jiffy

The key contacts have gotten dirty. They are often a conductive rubber pill that is pressed onto a circuit board. There are two pills per key and the difference in time of those contacting measures the velocity and the loudness for a piano voicing.

The contacts need to be cleaned with 99% isoprophyl alcohol and a Q-Tip. Use NO other solvent. Clean all contacts while the unit is open.

GREAT care must be taken with cables to avoid damage.

You did not specify your brand or model, but unless you are electronically adept, you should take it to a shop for repair.