Washington State has one of the most open and relaxed processes for public engagement.
It is helpful to know the bill number; they can be found on the legislature's home page.
House bills start with 1, the Senate's start with 5. Some bills are "substituted" (i.e., SHB / SSB)
A substitute bill is one that has been revised; and takes the place of the first bill.
You can find bills by it's topic on the search page, as well:
To comment on a bill, go to the bill's page and click "Comment on this bill". A new page will open.
The comment page will require your address to send it to the legislators from your district.
You can email any legislator; their email addresses are below:
You can testify at any committee hearing. Check the bill's webpage for the date/time.
To sign up, go to the Committee Sign In page. The Chamber and Committee on the drop down menu.
You can testify via Zoom, in person or in writing. Follow the instructions on the CSI page.