1) Go to 1940census.archives.gov:
2) Click on the "Census Search" tab at the top of the screen above. You get to the "Search" page which opens with the "Location" tab active:
If you know your state and Enumeration District (ED) number, then click on the "Enumeration district" circle and go to the next step. If you don't know the ED, then fill in the blanks on the "Location" form for State, County, City and Street. The site should take you to the Steve Morse website to help you narrow down your ED number search (it doesn't for me right now...).
3) On the Search page, with the "Enumeration District" button selected, enter the State and ED number:
Clicking on the "View It" button will eventually bring up the first page of the 1940 U.S. Census images for the Enumeration District.
4) When, or if, the "View It" button works, the Search page shows information about the Enumeration districts. It opens in the "Descriptions" tab. The other tabs are "Maps" and "Census Schedules."
I clicked on the "Census schedules" tab and saw:
There is a link to "View ED 62-63A" (noting there are 40 pages) below the tabs. I clicked on that and that leads to the census images for the specific ED.
It hasn't worked for me yet - at 6:42 a.m. PDT. Stuck at step 3 above. Frustrating, but not unexpected. I should have slept in but I would have missed all of the disappointment, eh?
7:23 a.m. PDT: Finally got to step 4 above, and it's been spinning for about 15 minutes.
8:08 a.m. Did a screen refresh even though it was still spinning, and got a black page with Download link at the top. Tried that and eventually got "404 not Found" screen. Back to the beginning.
8:15 a.m. I was able to download one page of the San Diego CA ED. Then it crashed when I tried the second page.
9 a.m. Still spinning to get back to where I was 45 minutes ago.