See the steps below.
Explanation:
On the Page Layout tab in Excel or the Design tab in Word, click Colors, and then click Customize Colors.
Click the button next to the theme color you want to change (for example, Accent 1 or Hyperlink), and then pick a color under Theme Colors.

To create your own color, click More Colors, and then pick a color on the Standard tab, or enter numbers or select a color on the Custom tab.
In the Sample pane, preview the changes that you made.
Repeat this for all the colors you want to change.
In the Name box, type a name for the new theme colors, and click Save.

Seethestepsbelow
Explanation:
In the Word Options dialog box, please (1) click Customize Ribbon in the left bar, (2) check Developer in the right box, and (3) click the OK button. ...
Click Developer > Date Picker Content Control . ...
Then the Date Picker is inserted into the document.

See the steps below.
Explanation:
1. Select the Home tab in the ribbon.
2. Select the dialog box launcher in the Styles group.
3. Select the Options button in the Styles task pane.
4. Select All styles in the Select styles to show drop-down menu in the Style Pane Options dialog box.
5. Select the OK button to close the Style Pane Options dialog box.
6. Scroll to Comment Text in the Styles task pane; hold your cursor over Comment Text to reveal the options arrow.
7. Select the options arrow and then select Modify from the drop-down menu.
8. Select the Format button in the Modify Style dialog box.
9. Select Language in the drop-down menu.
10. Select English (or another preferred language) in the Mark selected text as drop-down menu in the Language dialog box.
11. Uncheck Do not check spelling or grammar to ensure that Word will include your comments in spelling and grammar checks.
12. Select the OK button to close the Language dialog box.
13. Select the OK button to close the Modify Style dialog box.
14. Save, close, and then reopen the document to activate your new comment review settings.
Topic 8, Adventure Works
Exhibit.

See the steps below.
Explanation:
Click on the new button to select it (or Ctrl+Click, if a macro has been assigned to the button).
Click in the Name Box, at the left of the Formula Bar.
Type a new name, to replace the existing butto name.
Press Enter, to complete the name change.