Hello please how can I upgrade my phone

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

simeon444 wrote:

I want to update my phone

Then you would need to read the links provided above, or post relevant information as to why you can not update.