add a filter in Jira!

Assuming the interface of the moment at Jira on 4/4/2018:

1. Go to "Issues" by clicking the icon at the far left of the browser which looks like a magnifying glass inspecting four horizontal lines.
2. Click "View all issues and filters" at the upper right.
3. Click "New filter" at the upper left.
4. Change around the controls in a horizontal row below the word "Search" as needed. For example, in typing this up I opened up "Status" and checked the checkboxes for "Open" and "In Progress" to make a filter that will only show these statuses.
5. Click "Save as" by "Search" to save.
6. You will be prompted to give a name for your filter. Give a name.
7. Your filter should appear under the list of "Favorite Filters" at the lower left.

There will be an "Advanced" link at the upper right that when clicked turns into a "Basic" link to toggle back out of "Advanced" and when things are basic the WYSIWYG controls show and when things are advanced you will have the ability to type some query syntax like so:

status in (Open, "In Progress")