Time warp by source frame?

How do you use this?
I want a portion of a clip to extend to a certain time, I know I can use other methods than time warp. But, I want to try various settings that I see related to time warp. The documentation says adjust by source from is for setting a time where a frame is supposed to occur. Great. How do I do that? If I type a frame number into the source frame control, what is it doing? How do I specify that frame occur at a specific time?

I figured out how it works. I was confused because the frame is frozen on the keyframe and I hadn't added a keyframe at the end.
I did this:
Enable timewarp and adjust by source frame
Move to frame 0. enable animation. type the inpoint frame number from the footage and press enter.
Move to the frame to adjust. Type the frame it should be moved to and press enter.
Move to the end of the clip. Type the frame number that matches the end of the clip moved by the number of frames the 2nd keyframe was adjusted by.
Thanks. But, I am asking about time warp.
This seems close to giving the answer, because it at least uses source frames:
High quality retiming from 30 to 25 fps using After Effects
But, it involves changing fps. So, I am not able to think of how that would work for me, at the moment.
There are these things:
Frame to move 270
Frame at current desired position 247
Frame at start of selection 226
Maybe some of these are where you set a keyframe:
Keyframe at start
Keyframe at desired position
Keyframe at current position
When I select a clip to add to the composition and then select time warp from effects and select "Adjust time by source frame", the composition panel displays the first frame of the original footage.
The after effects help says that you can click the stopwatch to set a keyframe at "the current time" for that property value. Which current time?
If I click the stopwatch icon in effects controls for the source frame property, it stays selected. How do I indicate that I now want to go to a different location and set a keyframe?
If I knew how to set the keyframes, how would I tell it to now apply the time warp effect?
If I use the animation menu instead, there is an option to set a keyframe at the current source frame. Selecting that toggles the stopwatch icon, leaving me with the same questions.
If I click the triangle next to timewarp field in the composition window that lists clips, I can get at a diamond shaped icon to set key frames. I think I have set 3 keyframes at start, desired position for the end and the current position of the frame I want to occur at that position. Meanwhile the source frame property still says 226. If I scrub the composition windows displays that frame only...
I have no clue what I am supposed to do.
I missed this part of the documentation:
If you choose Source Frame for Adjust Time By, then you must animate the Source Frame property to do anything other than freeze on one frame.
But, so far, I haven't figured out how you animate the source frame. Whatever value I put in it is the frame that is frozen. I don't see how to then add another step in the animation.

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