How do I update it?

xiulin193 Said:

"How do I update it?: Because I’m pressing on the software and it just shows nothing"

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Updating an iPad:

Do so by using a compatible device, and reliable connection.

I. Start Here: If your iPhone, iPad or iPod touch won’t Update - Apple Support

II. Verify Compatibility:

1. Go to: Settings
2. Tap: General
3. Tap: About
4. View: the model shown

Then, see if the device is shown here:

Go here: iPad Models Compatible with iPadOS 15.5 - Apple Support

III. If compatible...

Use of a Computer to Update:

My User Tip: Making Use of a Computer for Updating an iOS Device - User Tip

It is a little hard to help/advise you when you provide little to NO useful information about your iPad.

Here are my questions to you.

Can you, please, confirm what year and model iPad do you have/own?

The “A” model number can be found on the aluminium back of your iPad, in very small print, right under the larger bold print “iPad” on the back of the iPad.

AND/OR

Supply the “M” model number, which can be found in the Settings app, under the General settings panel, then tap About.

What iOS/iPadOS version is this iPad, currently, running?

What is the rated, internal data storage space/capacity of your iPad model and how much of this free, internal data storage capacity is left inside of your iPad model?

All of that additional info can, also, be found in the Settings app, General settings panel, About.

Please try to make an attempt to answer all questions asked.

Thank You.