Density Plot

I am completely new to R and R Studio and I have to create a barplot/density plot for some data given to me by a professor. I am trying to get categorial data of Population 1 and Population 2 on the x and integer data for the number of parasites in each with a range up to 1000 on the y, but I can not figure out the commands. I think I need to isolate each of those populations from the dataframe, but I'm not sure if that is correct either. Any help is greatly appreciated.

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I guess right now I am unsure of how to properly ask my question. I have a column in the data.frame that I have changed from integer to a factor with 2 levels, Population 1 and Population 2. Each population has males and females and a number of parasites that was observed in each individual for each population. I have also changed the numbered individuals from an integer to a factor with multiple levels so that the individuals are categorical. I am wanting to isolate just one of the populations from the data.frame to work with, such as only Population 1 or only Population 2. The data.frame is pupfishB, is there something I can type in after pupfishB$POPULATION to further isolate the column to only Population 1 or Population 2? I am certainly not looking to get the work done for me as I need to learn how to use R effectively and efficiently. Thank you for your help.