I have been using an extension cord ...

[Bambook]

Thank you. You are right. Unfortunately I cannot correct it myself, but I will contact our webmaster, who should be able to sort out my blunder.

Here as well. The below "unmarked" in bold should not that be "marked" instead? https://www.usingenglish.com/articles/english-tenses-aspect-3-marked-tense.html#sdendnote5sym
"Without explicit or implicit context, the use of the marked tense does not of itself imply past time; and describing past time does not necessarily involve the use of the unmarked tense."