I wanted to measure the resistance in ohms of an apple, so I plugged my digital multimeter into either end of the apple and adjusted the settings up to 200k and it gave me a reading of about 68. Because the meter was set to 200k does that mean I have to do 68 x 200000 to get the number of ohms for the apple or something else? Sorry, I'm new to all this.
Despite the fact the manual for your particular meter is missing, there are some fundamental concepts to using multimeters which you should familiarize yourself with.
Alternatively, you may want to acquire or borrow a meter with a manual and read up on it.
Ranges on meters denote the maximum value that the range supports. So
200k means you can measure from 0 to 200 kΩ. All of the readings shown while using that range should be in kΩ.
For example, if you instead set the range to 200 Ω, it would measure from 0 to 200 Ω, in which case the apple at 68kΩ would be out of range. The multimeter would display some sort of message to indicate out of range, but this differs by manufacturer/model.