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Or, for tabular datasets, you may change the time constraint in the URL to something like time>now-2days so that the image will always show the data from 2 days ago until now. (more information)
Or, for tabular datasets, you may change the time constraint in the URL to something like time>max(time)-2days so that the image will always show the last 2 days worth of data from the dataset. (more information)
<img src="https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.png?sst%5B(last)%5D%5B(0.0)%5D%5B(22.0):(50.0)%5D%5B(225.0):(255.0)%5D&.draw=surface&.vars=longitude%7Clatitude%7Csst&.colorBar=Rainbow%7CC%7CLinear%7C8%7C32%7C" alt="SST, Blended, West US (Experimental, 5 Day Composite)">
Or, if you want to be fancy, here is an example that includes "largest" and "edit" links. Note that the URLs have different file extensions (.largePng, .graph, and .png).
<a href="https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.largePng?sst%5B(last)%5D%5B(0.0)%5D%5B(22.0):(50.0)%5D%5B(225.0):(255.0)%5D&.draw=surface&.vars=longitude%7Clatitude%7Csst&.colorBar=Rainbow%7CC%7CLinear%7C8%7C32%7C">largest</a> <a href="https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.graph?sst%5B(last)%5D%5B(0.0)%5D%5B(22.0):(50.0)%5D%5B(225.0):(255.0)%5D&.draw=surface&.vars=longitude%7Clatitude%7Csst&.colorBar=Rainbow%7CC%7CLinear%7C8%7C32%7C">edit image / download data</a> <br> <img src="https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.png?sst%5B(last)%5D%5B(0.0)%5D%5B(22.0):(50.0)%5D%5B(225.0):(255.0)%5D&.draw=surface&.vars=longitude%7Clatitude%7Csst&.colorBar=Rainbow%7CC%7CLinear%7C8%7C32%7C" alt="SST, Blended, West US (Experimental, 5 Day Composite)">
That example makes these links and this image:
Or,
you can join the ERDDAP Google Group / Mailing List by visiting
https://groups.google.com/forum/#!forum/erddap
and clicking on "Apply for membership".
Once you are a member, you can post your question there
or search to see if the question has already been asked and answered.