Hi guys. I have a small question. Can I solder a wire on the top of the board without unsoldering a pin header? (example in the photo) Don't judge me I just only study and want to know.
Yes
Thanks. I thought that there is a pin header and everything will go wrong. I appreciate the answer
Oh yeah. You wouldn't unsolder that header even if you tried.
Ahah I tried, yes. It was actually a strong a pin header. Thanks for the answer.
I would also advise that you tin the wire first and cut it off to less than 0.1" showing. Lay the wire against the pin, apply the iron and push the wire into the pin using very slight pressure. Then hold still while still applying the sideways pressure as you remove the iron and the joint cools.
Sounds a lot when you write it down, but you will soon get the hang of it.
It can if the iron is too hot or applied for too long and the pin can get pushed down and stick out further from the end of the other pins.
Thank you
The connection will be fragile and the wire will break soon at the point where solder ends. I would hot glue the wire to the board as a "strain relief".
In that regard, I have always(?) used a technique where I strip a small part of the insulation, tin the exposed part and while hot, pull the insulation well back along the stranded (we are of course talking about stranded wire), twist it to keep the strands compact, then tin all the exposed part and finally, carefully slip the insulation back along the tinned part while still hot.
This means that the junction between the stiffened part due to the solder, and the flexible part, is already under the insulation and thus reinforced as far as possible.
Yes, hot melt glue is also useful. 
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