If you have an Instagram account and have ever used the “filters” feature, then you know how to add a filter to an existing photo. However, if you don’t have an Instagram account and want to add a filter to an existing photo on your computer, there are a few ways that you can do it. The first way is to open the photo in your computer’s photo editor and select the “filter” option from the top left corner of the window. Then, select the “add filter” button and choose the type of filter that you want to use. The second way is to open a photo in your computer’s photo editor and select the “filter” option from the top left corner of the window. Then, select the “add filter” button and choose one of the following: “bokeh,” “grayscale,” or “monochrome.” Finally, click on OK to add the filter. The third way is to open a photo in your computer’s photo editor and select the “filter” option from the top left corner of the window. Then, select one of these: “bokeh,” “grayscale,” or “monochrome.” Finally, click on OK to add a filter.