The BEHANDLA wood treatment oil is nothing more than mineral oil with some wax mixed in. I am not specifically knowledgeable with the product but there are many that are very similar. These oil/wax treatments are applied very similarly. Wipe on a light coat, let set for a few minutes and then wipe off all the excess. Let it set for a short while and then wipe it dry again.
From your pictures I can see that you have applied too much oil. You need to remove the excess. To do this wet a rag with mineral spirits and thoroughly wipe down the top surface immediately followed by wiping with dry, clean paper towels. It would be best if you apply the mineral spirits using four aught steel wool. When you have removed the excess oil, apply a very light coat of the BEHANDLA wood treatment oil being sure you wipe off all the excess. The BEHANDLA wood treatment oil is not a drying oil so you must wipe it dry or the oil will transfer to items placed on the top.
In the future, when the top looks "dry" again apply a thin, light coat of the oil being sure to thoroughly wiping off the excess.
AS to your final question I would recommend you not apply any other finish. The oil/wax product you used will have penetrated into the wood and is unlikely that you can remove it completely. Any residue will prevent adequate or full adhesion off any other treatment.