Think many of us can use the appropriate tag for this :-)

Can't, don't worry, persevere and it will open to you due to rank.

I see many of us, I am one, who refers to a source that is outside the Perplexus server. While that, in the interim is fine, to get your point [whatever that may be] across, may very well reflect badly upon the integrity of Perplexus if a reference site 'goes down'.

Consider firstly that a problem needs an image and it is posted 'outside'. Without the picture there is the potential for future visitors to lack understanding of the problem.

My point simply is that everything pertinent to one's problem, be it the text, imagery or solution must reside on the Perplexus server. Should any other reference links disappear (typically, Wolfram, Wiki, Sloane - sorry for he abbreviations) the information can be found in some form via a search engine.

So, please attempt to make your total problem contained within the Perplexus environment; info linkages given the search engine dispensation.