Education on Pool multiport tap on filter? First time w/ a pool. I need some education on the multi-port...

First time w/ a pool. I need some education on the multi-port spigot on my pool filter. The three pipes coming up to the valve read, "cleaner," "skimmer," and "suction." (suction is right before the final skimmer/filter)
#1- Which setting do I set it on for normal vacuum and circulation? (I think "cleaner" setting is for backwashing, not too sure though). I am have a problem with algae and the more I clean the walls of the pool, the more muggy my hose down gets even with the pump on.
#2- The bar on the valve reads "off" on the contrary end of the handle itself. This may nouns elementary, but which direction do I place the handle? Does the handle itself align next to the pipe in the direction of flow or the opposite?
Answers:    I'm going to guess that this spout is on the intake side of the pump since you say one pipe is labeled suction. That pipe should be going to the horizontal (intake or suction) side of the pump.
The other 2 pipes go to the pool intakes. The one labled skimmer is of late that, the skimmer or overflow. Some pools have a port in the side of the pool specifically specifically for connecting a cleaner, like a Hayward Navigator. I assume that is the "cleaner" pipe. Now, what is missing is the bottom drain intake pipe.
There have to be one, not sure unless you take some pictures of the valve.
The touch itself aligns with the pipe that will be connected to the suction. Exactly opposite the toy with will be shut off.
You can put the handle in the middle (or any point) between the 2 intakes and it will draw respectively. If the handle is towards one pipe more, it will draw more.
Hope this helps but it is rugged to understand what multivalve you are talking going on for, since pools usually have 2 or more.
There is always one on the intake(suction) side and usually here is one on the outlet of the filter that returns filtered water to the pool. I would look for the outlet of the filter and formulate sure that it is not in the recirculate or bypass position, but in the "filter" position. Also check the one on the pump side and formulate sure it is set to skimmer, not cleaner, unless you have your kreepy Krawly hooked up to the port in the pool.
Hope this help!