Adding instrument names to a chart created with 2.3.2, which didn't have instrument names

Hi, I created a chart with the 2.3.2 version, consisting of alto sax, piano and bass. The names of the instruments probably used to be at the beginning of the staves, and I probably took them away to make the staves longer.

But I'm deciding now to add the names of the instruments back to the beginning of the staves, but I can't find where to do that. I've seen an icon for "instrument change", but I can't find one for adding an instrument name.

So, I'm wondering if there is an icon for adding that (the instrument name at the beginning of the staff).

Thank you.

Roderick Camelia.