The Issues View displays a list of all the issues in the repository sorted by most recently created.
To navigate to the Issues View select Issues from the left sidebar.

Add New Issues
To add new issues select the New Issue button at the top left of the Issues View.

This will open the Create New Issue modal. There are inputs to add a title and description.

To add labels or assignees select the Labels or Assignees links to the right of the input boxes.

Once the dropdown is open select labels or assignees from the dropdowns.

Once finished, select the Submit new issue button to finally submit the issue.

Edit Existing Issues
Select an issue from the list of issues.

A modal displaying the issue's details will be opened. Any edits made in this modal will be automatically saved and updated in GitHub.
Here you can add comments by typing in the input box and selecting the Comment button when you are ready to publish your comments

In order to add/remove labels or assignees select the Labels or Assignees links on the right to open the dropdowns.

Once the dropdown is open, select a label to add. If the label is already selected it will have a checkmark. Selecting a label that is already selected will remove it from the list and therefore remove it from the issue.

The Assignees dropdown works exactly the same as the Labels dropdown. Select Assignees to open the dropdown. Once the Assignees dropdown is open select an assignee to add or remove them from the issue.
Search Existing Issues
Using the search bar, at the top of the list of issues in Issues View, users can search for issues by name.

To clear the search bar select the X button on the right side of the search bar.
Filter Existing Issues
Filtering issues allows the user to filter issues by authors and labels. Users can also sort issues with the sort dropdown.

To select a filter or sort order select the Authors, Labels, or Sort dropdown link to the top right of the list of issues.

Select an option from the dropdown and the list of issues will begin filtering.