I am not sure what the threshold is now (it was increased recently I think) but you have to submit a certain number of checklists per year in order to be able to "report" misidentified media. The theory behind this is that by and large, those who submit more checklists are going to be more knowledgeable and keen birders so that not every old Joe Schmoe can incorrectly flag species as wrongly-identified.
IF you meet the threshold you will be able to see a small "report" button to the bottom right of the media in eBird. If you can't see that button, then, unfortunately, there is nothing you can do short of contacting the local reviewer for the area.
As Jerome Fischer concluded, this is Yellow Tyrannulet. They are rather sparse in Colombia and often associated with Guaduas bamboo (eg at the El Paujil Proaves Reserve). Looking through the first couple dozen images of this species on eBird (filtered for Colombia), it appears as if at least 50% of the images are incorrectly identified so yes, I think it it safe to assume that a lot of the records are erroneous. One more task to add to my list for Colombia ebird review