How do I update my iPhone when there is not enough space

The info for how to use your computer to update is in the article that lead you here. Update your iPhone or iPad - Apple Support

If you want to do it without a computer you’re going to need to delete some data from your phone so you can free up enough space for the update.

Murray1933 Said:

"I update with low space last time using my laptop. I don't remember what I did. I don't know what to delete. I'm 90 years old."

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Troubleshooting iPhone Device Storage:

Try Removing Data from the iPhone itself...

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Use my two User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip

Murray1933 wrote:

I update with low space last time using my laptop. I don't remember what I did. I don't know what to delete. I'm 90 years old.

Depending on what type of computer you have:

Update your iPhone, iPad, or iPod touch with the Finder - Apple Support

Update your iPhone, iPad, or iPod touch with iTunes - Apple Support