I already cooked my spaghetti, urgent help
Whether it can be saved depends on how much extra salt was added.
If large amount, the spaghetti will be untasty & hard to fix/make edible.
If small to medium amounts, there are some techniques...
1a) Make another batch, same size, with no salt, then mix the 2 batches.
1b) Add another cooked starch, like potatoes or rice, to absorb some of the salty taste.
2a) Make everything else you would serve on the spaghetti without salt...tomato sauce etc. Omit or reduce cheese and processed meat (which are both heavy on salt).
2b) Make a no-salt cream based sauce (dairy absorbs some of the salt).
For futures: remember how this happened, and use less salt in preparing the pasta. Also, add salt in moderate amounts and taste as you go.
If all fails, it's a relatively inexpensive mistake.
Hope you can fix it.