How to change settings in a PowerPoint theme?

Question

I have a .pptx presentation that contains a specific theme named ModernPortfolio.

In this theme are defined some settings, such as the:

• Font Type
• Font Color
• Fixed Structure of some slides (for example I have a slide where the model defines fixed non-exchangeable images and under this image a text area)

What can I do to change these settings?

Answer 1

PowerPoint 2010:

Change Font Colour:

• Select your theme.
• Click the Design Tab > Colours (in themes group) > Create new Theme Colors
• Change your colors.
• Click save

Change Fonts:

• Select your theme.
• Click the Design Tab > Fonts (in themes group) > Create New Theme Fonts
• Change your colors.
• Click save

PowerPoint 2013:

Change Font Colour:

• Select your theme
• Click the Design tab > Click the arrow in the variants tab > Click Colors > Customize colors
• Change your colors
• Click save

Change Fonts:

• Select your theme
• Click the Design tab > Click the arrow in the variants tab > Click Fonts > Customize Fonts
• Change your fonts
• Click save

For your last thing:

...fixed structure of some slides (for example I have a slide where the model defines a fixed non-exchangeable images and under this image a text area)

I think what you want to do is change the Slide Master. Please correct me if I'm wrong. Look here for details on how to change the slide master.