How to insert text box in PDF without desktop software?

My boss needs a signed PDF back today and I’m stuck on my work laptop where I can’t install anything. How do I generate a signature for the file?

had the same thing last month with a last minute form. tbh i just printed the page, signed it with a pen, took a pic on my phone and emailed that. if you really need a pdf maybe try opening it in word, stick a text box on there for the name then print to pdf. not pretty but it worked for me.