I forgot how to set thermostat in wall oven

this normally caused bt a faulty thermostat,test with a multi meter,if you dont have one then just fit a new thermostat

Is the clock set to auto and not manual? Is the clock display flashing? If so then set to manual, this should do the trick

check that the oven thermostat probe inside the oven is not close to or touching one of the upper oven elements

Hi, unplug the unit or shut off the circuit breaker for 5 minutes. Plug the unit back in or turn on the circuit breaker. Set the clock and gently try moving the door lock lever (is so equipped) or opening the door. Set the self-clean cycle again and only allow it to work for 15 minutes. Cancel the self-clean cycle and allow the oven to cool. Gently try moving the door lock lever (is so equipped) or opening the door. If these procedures fail to correct the condition, the lock must usually be accessed and moved manually to open the door.
*Note: Some model ovens require the oven door to be manually unlatched before the controls are returned to the OFF position or else the door may not be able to be unlocked. Check the owner's manual for proper operating procedures.

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or
Set the self-clean cycle again and only allow it to work for 15 minutes. Cancel the self-clean cycle and allow the oven to cool. Gently try moving the door lock lever (is so equipped) or opening the door.
If these procedures fail to correct the condition, the lock must usually be accessed and moved manually to open the door.
Some model ovens require the oven door to be manually unlatched before the controls are returned to the OFF position or else the door may not be able to be unlocked. Check the owner's manual for proper operating procedures.

Normally you should have an appliance spare parts supplier in your area. They generally stock all range of spares for all appliances. You need to pull plug out of the wall and remove the panel covering the wiring to gain access to the oven thermostat. Look carefully on the body of the thermostat and record any numbers you see on a sticker that's present. Then remove knob off in front of thermostat and see if there is a nut attached to the centre which holds the thermostat in position or if there are 2 screws holding the thermostat in place. Use this information to order the thermostat also quoting the oven model number.

It could be the plug/receptacle that the element plugs into. It could also be that the elements have separate thermostats and that the one for the lower element is bad. If you can post the model number I can look at the electrical schematic and know for sure if it has one or two thermostats.

You will need to have the thermostat looked at or replaced, it may be defective and not reading the correct temp, also try using a manual oven thermometer to check the actual temp in the oven to give you a better idea of what the actual temp is inside

This is an erratic operation of the thermostat you can reset the thermostat. Please check the reset operation procedure of the installation manual